[iggymcfly]

In a live game, you should have some kind of a read to help you with the river decision, but from your description of villain as a rich guy who's likely to play a little passive, I think you can fold to a river push unless something in his body language gives you reason to call. If it were an online game, I'd call any river but an ace under the rationale that he wouldn't try to bluff but may decide to value-bet the river with ace-high trips once he realized he was committed.

As played, with 1100 left and 2100 in the pot, I'd probably bet 850 since that's what you bet on the turn and it may look just reluctant enough to get a call from trips where a shove wouldn't.